How to add objects in NSMutableArray with for loop?

Question

Here, the issue is nothing but I don't know much about objectiveC. So the query is that I am working on a project where user taps on Image and with UITapGestureRecognizer I have to store that tapped position in my array. I don't know how is this possible that every time user taps the view and CGPoint value gets stored in NSMutableArray.

dataArray = [[NSMutableArray alloc] init];
for (NSInteger i = 0; i < [getResults count]; i++) {

[dataArray addObject:tappedPoint];
NSLog(@"RESULT TEST %@", dataArray);
}

[THIS](http://stackoverflow.com/questions/2684463/how-do-i-add-a-cgpoint-to-nsmutablearray) answers your question. You will have to try it yourself. — n00bProgrammer, Aug 02 '14 at 06:05

Brian Tracy · Accepted Answer · 2014-08-02T06:32:28.810

1

You need to subclass UIView and implement the method - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event to get a touch callback. Second, a touch location (CGPoint) cannot be added to an NSMutableArray, but a wrapper class for it can (NSValue). Here would be a very basic implementation of what you are going for.

// in UIView subclass
// Precondition: you have an NSMutableArray named `someMutableArray'
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    CGPoint touchLocation = [[touches anyObject] locationInView:self];
    NSValue *wrapper = [NSValue valueWithCGPoint:touchLocation];

    [someMutableArray addObject:wrapper];
}

If you want to loop through these touch locations later, all you have to to is fast enumerate through the array and unwrap the NSValues.

for (NSValue *wrapper in someMutableArray) {
    CGPoint touchLocation = [wrapper CGPointValue];
}

edited Aug 02 '14 at 06:32

answered Aug 02 '14 at 06:26

Brian Tracy

6,801
2
33
48

Thanks Brian Tracy, you mean that i don't need to implement any for loop,right? – Sushil Sharma Aug 02 '14 at 06:30
@SushilSharma No, unless you want to loop through all of the touch locations later. – Brian Tracy Aug 02 '14 at 06:30
Ok,so with this code it will add objects one after another,every time user taps the view. – Sushil Sharma Aug 02 '14 at 06:34
Thanks Brian Tracy,thanks a lot for your great solution. – Sushil Sharma Aug 02 '14 at 06:39

How to add objects in NSMutableArray with for loop?

1 Answers1